diff --git a/gradle.properties b/gradle.properties
index 549826a8..2ab4daa9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,7 +2,7 @@
 
 jjVersion = 0.9.7-SNAPSHOT
 
-## default artifact name (used if -Partifact= isn't specified on the command line)
+## default artifact ID (used when -Partifact= isn't specified on the command line)
 artifact = jolt-jni
 #artifact = jolt-jni-Android
 #artifact = jolt-jni-Linux64
@@ -33,7 +33,7 @@ artifact = jolt-jni
 #target = MacOSX_ARM64
 #target = Windows64
 
-## options to specify the preferred native toolchain
+## options to specify the preferred native toolchain (used when -Ptool= isn't specified on the command line)
 ##   These options affect desktop builds but not Android builds.
 #tool = clang
 #tool = gcc
diff --git a/src/main/java/com/github/stephengold/joltjni/Mat44.java b/src/main/java/com/github/stephengold/joltjni/Mat44.java
index b430d94c..6f3e621c 100644
--- a/src/main/java/com/github/stephengold/joltjni/Mat44.java
+++ b/src/main/java/com/github/stephengold/joltjni/Mat44.java
@@ -107,7 +107,7 @@ public Mat44(RMat44Arg rMatrix) {
      * @param c1 the desired first/leftmost column (not null, unaffected)
      * @param c2 the desired 2nd column (not null, unaffected)
      * @param c3 the desired 3rd column (not null, unaffected)
-     * @param c4 the desired last/rightmost column (not null, unaffected)
+     * @param c4 the desired 4th/rightmost column (not null, unaffected)
      */
     public Mat44(Vec4Arg c1, Vec4Arg c2, Vec4Arg c3, Vec4Arg c4) {
         this(c1.getX(), c1.getY(), c1.getZ(), c1.getW(),
@@ -220,9 +220,9 @@ public void setElement(int row, int column, float value) {
     }
 
     /**
-     * Set the last/rightmost column to the specified vector.
+     * Alter the translation component.
      *
-     * @param vec the vector to use (not null, unaffected)
+     * @param vec the desired translation (not null, unaffected)
      */
     public void setTranslation(Vec3Arg vec) {
         long matrixVa = va();
@@ -655,7 +655,7 @@ public Vec3 multiply3x3Transposed(Vec3Arg vec3Arg) {
     }
 
     /**
-     * Multiply the 3x4 matrix by the specified column vector, with the last
+     * Multiply the 3x4 matrix by the specified column vector, with the 4th
      * component of the right factor implied to be one. The matrix is
      * unaffected.
      *
diff --git a/src/main/java/com/github/stephengold/joltjni/RMat44.java b/src/main/java/com/github/stephengold/joltjni/RMat44.java
index 7b98133e..a5d8eda9 100644
--- a/src/main/java/com/github/stephengold/joltjni/RMat44.java
+++ b/src/main/java/com/github/stephengold/joltjni/RMat44.java
@@ -70,7 +70,7 @@ public RMat44(Mat44Arg spMatrix) {
     }
 
     /**
-     * Instantiate from 4 column vectors.
+     * Instantiate a matrix with the specified columns.
      *
      * @param c1 the desired first/leftmost column (not null, unaffected)
      * @param c2 the desired 2nd column (not null, unaffected)
diff --git a/src/main/java/com/github/stephengold/joltjni/readonly/Mat44Arg.java b/src/main/java/com/github/stephengold/joltjni/readonly/Mat44Arg.java
index c0d8c2bd..964190f8 100644
--- a/src/main/java/com/github/stephengold/joltjni/readonly/Mat44Arg.java
+++ b/src/main/java/com/github/stephengold/joltjni/readonly/Mat44Arg.java
@@ -105,13 +105,12 @@ public interface Mat44Arg extends ConstJoltPhysicsObject {
      * Test whether the current matrix is an identity matrix. The matrix is
      * unaffected.
      *
-     * @return {@code true} if equal, {@code false} if unequal
+     * @return {@code true} if exactly equal, otherwise {@code false}
      */
     boolean isIdentity();
 
     /**
-     * Multiply the current matrix by the specified matrix. The current matrix
-     * is unaffected.
+     * Multiply the current matrix by the argument. The matrix is unaffected.
      *
      * @param m2 the right factor (not null, unaffected)
      * @return a new matrix
@@ -128,7 +127,7 @@ public interface Mat44Arg extends ConstJoltPhysicsObject {
     Mat44 multiply3x3(Mat44Arg arg);
 
     /**
-     * Multiply the 3x3 matrix by the specified vector. The matrix is
+     * Multiply the 3x3 matrix by the specified column vector. The matrix is
      * unaffected.
      *
      * @param vec3Arg the right factor (not null, unaffected)
@@ -137,8 +136,8 @@ public interface Mat44Arg extends ConstJoltPhysicsObject {
     Vec3 multiply3x3(Vec3Arg vec3Arg);
 
     /**
-     * Multiply the transpose of the 3x3 matrix by the specified vector. The
-     * matrix is unaffected.
+     * Multiply the transpose of the 3x3 matrix by the specified column vector.
+     * The matrix is unaffected.
      *
      * @param vec3Arg the right factor (not null, unaffected)
      * @return a new vector
diff --git a/src/main/java/com/github/stephengold/joltjni/readonly/RMat44Arg.java b/src/main/java/com/github/stephengold/joltjni/readonly/RMat44Arg.java
index 4f5987c1..fcb90b6a 100644
--- a/src/main/java/com/github/stephengold/joltjni/readonly/RMat44Arg.java
+++ b/src/main/java/com/github/stephengold/joltjni/readonly/RMat44Arg.java
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2024 Stephen Gold
+Copyright (c) 2024-2025 Stephen Gold
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -100,7 +100,7 @@ public interface RMat44Arg extends ConstJoltPhysicsObject {
      * Multiply the current matrix by the argument. The matrix is unaffected.
      *
      * @param m2 the right factor (not null, unaffected)
-     * @return a new vector
+     * @return a new matrix
      */
     RMat44 multiply(RMat44Arg m2);