diff --git a/include/avif/internal.h b/include/avif/internal.h
index 7b96b66d4a..687c8ca249 100644
--- a/include/avif/internal.h
+++ b/include/avif/internal.h
@@ -196,9 +196,9 @@ typedef enum avifSampleTransformTokenType
 typedef struct avifSampleTransformToken
 {
     uint8_t type;                // avifSampleTransformTokenType
-    int32_t constant;            // If value is AVIF_SAMPLE_TRANSFORM_CONSTANT.
+    int32_t constant;            // If type is AVIF_SAMPLE_TRANSFORM_CONSTANT.
                                  // Only 32-bit (bit_depth=2) constants are supported.
-    uint8_t inputImageItemIndex; // If value is AVIF_SAMPLE_TRANSFORM_INPUT_IMAGE_ITEM_INDEX. 1-based.
+    uint8_t inputImageItemIndex; // If type is AVIF_SAMPLE_TRANSFORM_INPUT_IMAGE_ITEM_INDEX. 1-based.
 } avifSampleTransformToken;
 
 AVIF_ARRAY_DECLARE(avifSampleTransformExpression, avifSampleTransformToken, tokens);
diff --git a/src/read.c b/src/read.c
index 889d2f112e..7f36c1c6c1 100644
--- a/src/read.c
+++ b/src/read.c
@@ -2031,7 +2031,7 @@ static avifBool avifParseToneMappedImageBox(avifGainMapMetadata * metadata, cons
 #endif // AVIF_ENABLE_EXPERIMENTAL_GAIN_MAP
 
 #if defined(AVIF_ENABLE_EXPERIMENTAL_SAMPLE_TRANSFORM)
-// bit-depth is assumed to be 2 (32-bit).
+// bit_depth is assumed to be 2 (32-bit).
 static avifResult avifParseSampleTransformTokens(avifROStream * s, avifSampleTransformExpression * expression)
 {
     uint8_t tokenCount;