diff --git a/src/commands/CmdDelete.cpp b/src/commands/CmdDelete.cpp
index 5109d383..e75890c0 100644
--- a/src/commands/CmdDelete.cpp
+++ b/src/commands/CmdDelete.cpp
@@ -56,7 +56,6 @@ int CmdDelete (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     database.deleteInterval (tracked[tracked.size () - id]);
 
     if (rules.getBoolean ("verbose"))
diff --git a/src/commands/CmdJoin.cpp b/src/commands/CmdJoin.cpp
index 68933513..1e788f0d 100644
--- a/src/commands/CmdJoin.cpp
+++ b/src/commands/CmdJoin.cpp
@@ -58,7 +58,6 @@ int CmdJoin (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-  // Note: It's okay to subtract a one-based number from a zero-based index.
   auto first_id  = std::max (ids[0], ids[1]);
   auto second_id = std::min (ids[0], ids[1]);
   Interval first  = tracked[tracked.size () - first_id];
diff --git a/src/commands/CmdLengthen.cpp b/src/commands/CmdLengthen.cpp
index 5f46fe64..f07c8af2 100644
--- a/src/commands/CmdLengthen.cpp
+++ b/src/commands/CmdLengthen.cpp
@@ -65,7 +65,6 @@ int CmdLengthen (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     Interval i = tracked[tracked.size () - id];
     if (i.range.is_open ())
       throw format ("Cannot lengthen open interval @{1}", id);
diff --git a/src/commands/CmdMove.cpp b/src/commands/CmdMove.cpp
index b076d2fe..096247cc 100644
--- a/src/commands/CmdMove.cpp
+++ b/src/commands/CmdMove.cpp
@@ -68,7 +68,6 @@ int CmdMove (
     throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
   // Move start time.
-  // Note: It's okay to subtract a one-based number from a zero-based index.
   Interval i = tracked[tracked.size () - id];
   Datetime start (new_start);
 
diff --git a/src/commands/CmdShorten.cpp b/src/commands/CmdShorten.cpp
index 6a3ac36d..98f97b70 100644
--- a/src/commands/CmdShorten.cpp
+++ b/src/commands/CmdShorten.cpp
@@ -65,7 +65,6 @@ int CmdShorten (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     Interval i = tracked[tracked.size () - id];
     if (i.range.is_open ())
       throw format ("Cannot shorten open interval @{1}", id);
diff --git a/src/commands/CmdSplit.cpp b/src/commands/CmdSplit.cpp
index 84c2bbcf..c54bd1ab 100644
--- a/src/commands/CmdSplit.cpp
+++ b/src/commands/CmdSplit.cpp
@@ -58,7 +58,6 @@ int CmdSplit (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     Interval first = tracked[tracked.size () - id];
     Interval second = first;
 
diff --git a/src/commands/CmdTag.cpp b/src/commands/CmdTag.cpp
index 800330f0..b45052f3 100644
--- a/src/commands/CmdTag.cpp
+++ b/src/commands/CmdTag.cpp
@@ -63,7 +63,6 @@ int CmdTag (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     Interval i = tracked[tracked.size () - id];
 
     for (auto& tag : tags)
diff --git a/src/commands/CmdUntag.cpp b/src/commands/CmdUntag.cpp
index ce70df44..c15fc12f 100644
--- a/src/commands/CmdUntag.cpp
+++ b/src/commands/CmdUntag.cpp
@@ -63,7 +63,6 @@ int CmdUntag (
     if (id > static_cast <int> (tracked.size ()))
       throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
-    // Note: It's okay to subtract a one-based number from a zero-based index.
     Interval i = tracked[tracked.size () - id];
 
     for (auto& tag : tags)