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-rw-r--r--src/mesa/main/dd.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 76411b31e5a..1e5aca13a48 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -355,7 +355,9 @@ struct dd_function_table {
* \param mode bitmask of GL_MAP_READ_BIT, GL_MAP_WRITE_BIT and
* GL_MAP_INVALIDATE_RANGE_BIT (if writing)
* \param mapOut returns start of mapping of region of interest
- * \param rowStrideOut returns row stride (in bytes)
+ * \param rowStrideOut returns row stride (in bytes). In the case of a
+ * compressed texture, this is the byte stride between one row of blocks
+ * and another.
*/
void (*MapTextureImage)(struct gl_context *ctx,
struct gl_texture_image *texImage,