diff --git a/src/rvoice/fluid_chorus.c b/src/rvoice/fluid_chorus.c
index 8f8b3c00..88ed39f0 100644
--- a/src/rvoice/fluid_chorus.c
+++ b/src/rvoice/fluid_chorus.c
@@ -980,7 +980,11 @@ void fluid_chorus_processmix(fluid_chorus_t *chorus, const fluid_real_t *in,
             d_out[1] +=  out ;
         }
 
-        /* Write the current input sample into the circular buffer */
+        /* Write the current input sample into the circular buffer.
+         * Note that 'in' may be aliased with 'left_out'. Hence this must be done
+         * before "processing stereo unit" (below). This ensures input buffer
+         * not being overwritten by stereo unit output.
+         */
         push_in_delay_line(chorus, in[sample_index]);
 
         /* process stereo unit */
@@ -1052,7 +1056,11 @@ void fluid_chorus_processreplace(fluid_chorus_t *chorus, const fluid_real_t *in,
             d_out[1] +=  out ;
         }
 
-        /* Write the current input sample into the circular buffer */
+        /* Write the current input sample into the circular buffer.
+         * Note that 'in' may be aliased with 'left_out'. Hence this must be done
+         * before "processing stereo unit" (below). This ensures input buffer
+         * not being overwritten by stereo unit output.
+         */
         push_in_delay_line(chorus, in[sample_index]);
 
         /* process stereo unit */