diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index c4454550dbc..2641123857a 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -1149,6 +1149,11 @@ _mesa_IsFramebufferEXT(GLuint framebuffer)
 }
 
 
+/**
+ * Check if any of the attachments of the given framebuffer are textures
+ * (render to texture).  Call ctx->Driver.RenderTexture() for such
+ * attachments.
+ */
 static void
 check_begin_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
 {