diff --git a/MANUAL.txt b/MANUAL.txt
index 3594a541c..f337e0808 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -4701,6 +4701,9 @@ option):
 Both methods allow incremental and nonincremental lists to be mixed
 in a single document.
 
+Note: Neither the `-i/--incremental` option nor any of the
+methods described here currently works for PowerPoint output.
+
 Inserting pauses
 ----------------
 
@@ -4715,6 +4718,8 @@ three dots, separated by spaces:
 
     content after the pause
 
+Note: this feature is not yet implemented for PowerPoint output.
+
 Styling the slides
 ------------------