diff --git a/Help/e_curvelinedefs.html b/Help/e_curvelinedefs.html
index b0e3ca3a..be1138d4 100755
--- a/Help/e_curvelinedefs.html
+++ b/Help/e_curvelinedefs.html
@@ -32,6 +32,22 @@
 			<td valign="top"><b>Escape</b></td>
 			<td>Discard the changes and return to the previous mode.</td>
 		</tr>
+		<tr>
+			<td valign="top"><b>Ctrl + Mousewheel</b></td>
+			<td>Increase/decrease the number of dividing vertices.</td>
+		</tr>
+		<tr>
+			<td valign="top"><b>LMB + Drag</b></td>
+			<td>Change the distance of the curve (when Fixed Circular Curve is not set).</td>
+		</tr>
+		<tr>
+			<td valign="top"><b>RMB + Drag</b></td>
+			<td>Change the angle of the curve.</td>
+		</tr>
+		<tr>
+			<td valign="top"><b>Ctrl + Alt + RMB + Drag</b></td>
+			<td>When Fixed Circlar Curve is set, increase/decrease the dividing vertices together with the angle of the curve to maintain a consistent circular curve</td>
+		</tr>
 		</table>
 	</p>
 	</div>
diff --git a/Source/Plugins/BuilderModes/ClassicModes/CurveLinedefsMode.cs b/Source/Plugins/BuilderModes/ClassicModes/CurveLinedefsMode.cs
index 62b10977..b7d7fd66 100755
--- a/Source/Plugins/BuilderModes/ClassicModes/CurveLinedefsMode.cs
+++ b/Source/Plugins/BuilderModes/ClassicModes/CurveLinedefsMode.cs
@@ -496,6 +496,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			else if(editpressed && prevoffset != 0)
 			{
 				int newangle = 0;
+				int newvertices = panel.Vertices;
 				if(panel.FixedCurve)
 				{
 					// Flip required?
@@ -513,7 +514,9 @@ namespace CodeImp.DoomBuilder.BuilderModes
 					//TODO: there surely is a way to get new angle without iteration...
 					double targetoffset = radius.GetLength() * u;
 					double prevdiff = double.MaxValue;
-					int increment = (clampvalue ? panel.AngleIncrement : 1);
+					bool clampToKeyEllipseSegments = General.Interface.CtrlState && General.Interface.AltState;
+
+					int increment = (clampToKeyEllipseSegments ? 15 : clampvalue ? panel.AngleIncrement : 1);
 					for(int i = 1; i < panel.MaximumAngle; i += increment)
 					{
 						// Calculate diameter for current angle...
@@ -530,7 +533,19 @@ namespace CodeImp.DoomBuilder.BuilderModes
 					}
 
 					// Clamp to 5 deg increments
-					if(clampvalue) newangle = (newangle / panel.AngleIncrement) * panel.AngleIncrement; 
+					if(clampvalue) newangle = (newangle / increment) * increment; 
+					
+					if(clampToKeyEllipseSegments)
+					{
+						newvertices = Math.Abs(newangle) / increment - 1;
+
+						if(newvertices < 1)
+							newvertices = 1;
+						if(newangle < 30)
+						{
+							newangle = 0;
+						}
+					}
 				}
 				else
 				{
@@ -543,7 +558,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 				}
 
 				// Set new angle without triggering the update...
-				panel.SetValues(panel.Vertices, panel.Distance, newangle, panel.FixedCurve, panel.FixedCurveOutwards);
+				panel.SetValues(newvertices, panel.Distance, newangle, panel.FixedCurve, panel.FixedCurveOutwards);
 
 				// Update hint text
 				hintlabel.Text = "Angle: " + panel.Angle;
diff --git a/Source/Plugins/BuilderModes/Resources/Hints.cfg b/Source/Plugins/BuilderModes/Resources/Hints.cfg
index 85317da9..ca703311 100755
--- a/Source/Plugins/BuilderModes/Resources/Hints.cfg
+++ b/Source/Plugins/BuilderModes/Resources/Hints.cfg
@@ -242,5 +242,6 @@ group general
 "<b>LMB-drag</b> or use <k>buildermodes_increasebevel</k> and <k>buildermodes_decreasebevel</k> to change curve depth. Hold <b>Shift</b> while dragging to change by 1 map unit" 
 "<b>RMB-drag</b> or use <k>buildermodes_rotateclockwise</k> and <k>buildermodes_rotatecounterclockwise</k> to change curve bulginess. Hold <b>Shift</b> while dragging to change by 1 degree"
 "<b>LMB+RMB-drag</b> or use <k>buildermodes_increasesubdivlevel</k> and <k>buildermodes_decreasesubdivlevel</k> to change the number of points in the curve"
+"When <b>CTRL+ALT+RMB-drag</b> When Fixed Circlar Curve is set, increase/decrease the dividing vertices together with the angle of the curve to maintain a consistent circular curve."
 "Press <k>builder_acceptmode</k> to accept"
-"Press <k>builder_cancelmode</k> or <k>builder_classicedit</k> to cancel"
\ No newline at end of file
+"Press <k>builder_cancelmode</k> or <k>builder_classicedit</k> to cancel"