Add Annotation to 3D Scatterplot in Plotly

I'm new to this arena and was hoping to get some help. I'm just starting to work with Plotly and am using it to build a very basic 3D Scatterplot that models some shelves and what items are where. While I built the "shelf" and the plot renders, I would like to add an Annotation to the text indicating which set of shelves I'm looking at.
Here is the current output of my program and this is what I am trying to do

I've tried reviewing the documentation and attempted to add an annotation (as I have for 2D Analogs) and while the code compiles, the text does not show up.

p <- plot_ly(all, x = X, y = Y, z = Z,  
    text = paste0("Candy: ", SKU,"; QTY: ", Qty), 
    color = OccupiedPct, 
    colors = cols,
    hoverinfo = "text",
    type = "scatter3d", mode = "markers") %>%
layout(
   title = "Shelves"
)
sub <- list(
    x = 3,
    y = 2,
    z = 0,
    text = "Shelf1",
    xref = "x",
    yref = "y",
    zref = "z",
    showarrow = FALSE
)
p %>%
   layout(annotations = sub)

Thank you in advance! Mike

UPDATE Thank you @MLavoie for your answer and sorry for excluding a reproducible dataset. Unfortunately I could not replicate what you had done. I noticed that the z-axis on your plot was set to zero and I tried to reset mine without success. However, even adjusting the point to be in the plot range, I still couldn't get it to show up. Here is the plot I got:

when I ran this code

set.seed(100)
d <- diamonds[sample(nrow(diamonds), 1000), ]

p <- plot_ly(d, x = carat, y = price, z=depth, text = paste("Clarity: ",     clarity),
         type="scatter3d", mode="markers")

p %>% 
  add_trace(x = 2.5, y = 5000, z = 56, type = "scatter3d", text = "test", mode = "text") %>% 
  add_trace(x = 2.5, y = 15000, z = 56, type = "scatter3d", text = "test", mode = "text") %>% 
  layout(
    xaxis = list(range = c(0, 5)),
    yaxis = list(range(0,20000)),
    zaxis = list(range(0,100)),
    showlegend = FALSE)

In the interest of completeness, here is my Session Info:

R version 3.2.1 (2015-06-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 8 x64 (build 9200)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] plotly_2.0.16 ggplot2_2.0.0

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.3      digest_0.6.9     grid_3.2.1       plyr_1.8.3       R6_2.1.2         jsonlite_0.9.19  gtable_0.1.2     magrittr_1.5     scales_0.3.0     httr_1.1.0      
[11] viridis_0.3.2    tools_3.2.1      htmlwidgets_0.5  munsell_0.4.2    yaml_2.1.13      base64enc_0.1-3  colorspace_1.2-6 htmltools_0.3    gridExtra_2.0.0

Thanks again!

Using the iris dataset (you did not provide a reproducible example) you could try:

set.seed(100)
d <- diamonds[sample(nrow(diamonds), 1000), ]

p <- plot_ly(d, x = carat, y = price, z=depth, text = paste("Clarity: ", clarity),
        type="scatter3d", mode="markers")

p %>% 
add_trace(x = 2.5, y = 5000, z = 0, type = "scatter3d", text = "test", mode = "text") %>% 
add_trace(x = 2.5, y = 15000, z = 0, type = "scatter3d", text = "test", mode = "text") %>% 
layout(showlegend = FALSE)

来源：https://stackoverflow.com/questions/37596865/add-annotation-to-3d-scatterplot-in-plotly

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